EP1696818A1 - Changement de l'amplitude du mouvement de la tete d'une brosse a dents par modification de sa frequence d'entrainement(en) changing amplitude of movement by changing the drive frequency of a toothbrush brushhead - Google Patents

Changement de l'amplitude du mouvement de la tete d'une brosse a dents par modification de sa frequence d'entrainement(en) changing amplitude of movement by changing the drive frequency of a toothbrush brushhead

Info

Publication number
EP1696818A1
EP1696818A1 EP04801524A EP04801524A EP1696818A1 EP 1696818 A1 EP1696818 A1 EP 1696818A1 EP 04801524 A EP04801524 A EP 04801524A EP 04801524 A EP04801524 A EP 04801524A EP 1696818 A1 EP1696818 A1 EP 1696818A1
Authority
EP
European Patent Office
Prior art keywords
frequency
amplitude
drive
change
resonant
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP04801524A
Other languages
German (de)
English (en)
Other versions
EP1696818B1 (fr
EP1696818B2 (fr
Inventor
Ronald C. Lilley
Scott E. Hall
John W. Pace
William E. Bryant
Joseph W. Grez
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips Electronics NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=34700008&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1696818(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Koninklijke Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Priority to DE602004006777.6T priority Critical patent/DE602004006777T3/de
Publication of EP1696818A1 publication Critical patent/EP1696818A1/fr
Publication of EP1696818B1 publication Critical patent/EP1696818B1/fr
Application granted granted Critical
Publication of EP1696818B2 publication Critical patent/EP1696818B2/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61CDENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C17/00Devices for cleaning, polishing, rinsing or drying teeth, teeth cavities or prostheses; Saliva removers; Dental appliances for receiving spittle
    • A61C17/16Power-driven cleaning or polishing devices
    • A61C17/22Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like
    • A61C17/221Control arrangements therefor
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61CDENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C17/00Devices for cleaning, polishing, rinsing or drying teeth, teeth cavities or prostheses; Saliva removers; Dental appliances for receiving spittle
    • A61C17/16Power-driven cleaning or polishing devices
    • A61C17/22Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02PCONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P25/00Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/02Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
    • H02P25/032Reciprocating, oscillating or vibrating motors
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61CDENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C17/00Devices for cleaning, polishing, rinsing or drying teeth, teeth cavities or prostheses; Saliva removers; Dental appliances for receiving spittle
    • A61C17/16Power-driven cleaning or polishing devices
    • A61C17/22Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like
    • A61C17/32Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like reciprocating or oscillating

Definitions

  • This invention relates generally to power toothbrushes, and more specifically 5 concerns such a toothbrush which is driven in a manner to produce a periodic change or variation in amplitude of a brushhead portion (which includes the bristles and bristle plate) of the toothbrush during operation thereof.
  • a brushhead portion which includes the bristles and bristle plate
  • This invention relates generally to power toothbrushes, and more specifically 5 concerns such a toothbrush which is driven in a manner to produce a periodic change or variation in amplitude of a brushhead portion (which includes the bristles and bristle plate) of the toothbrush during operation thereof.
  • a brushhead portion which includes the bristles and bristle plate
  • the present invention is a system for resonantly driving a power toothbrush having a resonant frequency, wherein a brushhead portion of the toothbrush moves in operation through a path with an amplitude about a center point, comprising: a resonant drive system for driving a brushhead at a drive frequency, the drive system 20 including a circuit for changing the drive frequency relative to the center frequency to produce a periodic change of amplitude of the brushhead portion within the range of 5- 30%, providing an improved sensory experience without discomfort to the user.
  • Figure 1 is a diagram of brushhead voltage (energy) against frequency for a power toothbrush having a known resonant frequency at approximately 259 Hz.
  • Figure 2 is a block diagram of one embodiment of the toothbrush drive system of the present invention.
  • Figure 3 is a diagram of brushhead voltage (energy) against frequency using the system of Figure 2.
  • Figures 4 and 5 show diagrams of change (variation) of amplitude and peak 30 amplitude against brushhead resonant frequency for a power toothbrush driven at 259 Hz.
  • Figures 6 and 7 show diagrams of change (variation) in amplitude against brushhead resonant frequency for a frequency modulated drive signal with different modulation rate ( Figure 6) and different maximum frequency deviations of the modulation ( Figure 7).
  • Figure 8 is a block diagram of another embodiment of the present invention.
  • Figures 9 and 10 are diagrams of variations in amplitude of the brush portion of the toothbrush against time and variation in drive frequency against time, respectively.
  • Best Mode for Carrying Out the Invention Typically, power toothbrushes having a brushhead portion designed to oscillate about a center position are driven at a preselected frequency, referred to herein as a center frequency Fc.
  • the center frequency is determined by the designer of the drive system and may be selected to be at or near the resonant frequency of the toothbrush to provide maximum efficiency relative to power consumed by the toothbrush during operation.
  • An example of such a toothbrush, using an electromagnetic drive system, is shown in U.S. Patent No.
  • Figure 1 shows a plot of brushhead voltage (energy) against frequency for a resonant drive toothbrush. Note that the plot line 12 has one large peak at region 14, in the vicinity of the resonant frequency of the toothbrush. As indicated above, it is known that amplitude of the toothbrush brushhead movement during its oscillation is a major factor in cleaning of the teeth, as well as providing the desired sensory effect of cleaning produced by action of the toothbrush. The sensory effect is quite important, as it provides the user an experience which indicates that an effective cleaning of the teeth and treatment of the gums has in fact occurred.
  • the drive frequency is changed periodically, about Fc, such as by frequency modulation, to produce a periodic change ( ⁇ ) in motion (amplitude) of the brushhead, producing in effect an amplitude (motion) modulation, which results in an increase in average amplitude of brush movement.
  • the closeness of the center frequency to the resonant frequency has a significant effect on the resulting change of amplitude of brush movement due to frequency modulation.
  • the center frequency is 259 Hz.
  • the peak amplitude approaches its highest point, while the change or variation in ⁇ amplitude approaches a minimum. This is shown graphically in Figures 4 and 5, with plots of peak amplitude (20) and change in amplitude (21) against resonant frequency for a toothbrush driven at a frequency of 259 Hz with frequency modulation.
  • Factors in the drive signal which affect the amplitude change of the brushhead include the frequency deviation (D) about Fc, i.e. the plus and minus variation of the drive frequency relative to the center frequency, the modulation frequency (F M ), the wave shape (all illustrated in Figure 10 (which is a plot of frequency against time) and the duty factor.
  • the combination of the above frequency modulation factors (in particular the modulation frequency (F m ), the frequency deviation (D) and the wave shape must maintain the change of amplitude within a range of 5-30%.
  • a change (variation) in amplitude is illustrated in Figure 9, which is a plot of brushhead amplitude variation against time for a frequency modulated drive signal about F .
  • the wave shape refers to the manner in which the drive frequency is changed, i.e. changing the drive frequency in one step is a square wave modulation signal, while changing the frequency in a series of smaller steps over time to reach the maximum deviation is a triangular wave modulation signal, such as shown in Figure 10.
  • changing the drive frequency in one step is a square wave modulation signal
  • changing the frequency in a series of smaller steps over time to reach the maximum deviation is a triangular wave modulation signal, such as shown in Figure 10.
  • the peak amplitude of brushhead motion is the greatest when
  • the center frequency must be some amount away from the resonant frequency of the device, in the present embodiment, approximately 3 Hz. While the factors discussed herein influencing change of amplitude for frequency modulation of the drive signal are based on a resonant drive system, it is quite possible that another type of modulation of the drive signal, resulting in a periodic change of amplitude, will also enhance cleaning effects and/or the sensory/brushing experience of cleaning in non-resonant systems as well.
  • the modulation frequency has a strong inverse effect on amplitude modulation.
  • a 12 Hz modulation frequency produces a change of amplitude within a particular range, depending upon the other factors of frequency deviation, wave shape and duty factor.
  • Increasing the modulation frequency from 12 Hz to 24 Hz reduces the change (variation) in amplitude or ⁇ A substantially, and further increasing the modulation frequency to 40 Hz brings the amplitude variation close to zero.
  • deviation (D) the change in frequency relative to the center frequency Fc, has a direct effect on the amplitude modulation.
  • the preferred deviation is +3.5 Hz. Doubling the deviation approximately doubles the change (variation) of amplitude.
  • Other factors influencing to some extent change of amplitude, as indicated above, include the wave shape of the modulation signal and the duty factor of the modulating frequency.
  • the use of a triangle wave shape for the change in modulating frequency as opposed to a square wave shape, has approximately half the effect on change of amplitude ( ⁇ A). With respect to the duty factor, the change in amplitude increases when the duty factor is reduced.
  • the preferred embodiment for an amplitude change ( ⁇ A) around 10%, has a resonant frequency of 262 Hz, a center frequency Fc of 259 Hz, a modulation frequency F M of 12 Hz and a frequency deviation (D) of 3.5 Hz.
  • the wave shape is triangular and the duty factor 48%.
  • Figure 3 shows the distribution of energy relative to frequency for such an arrangement, specifically the drive signal's frequency spectrum.
  • Figure 2 is a block diagram showing the structural implementation of the system described above.
  • a center frequency Fc is produced by a circuit, block 30.
  • the center frequency is applied to a frequency source circuit 32, to which is also supplied the frequency modulation signal F by block 34.
  • the frequency generated by the frequency source 32 is applied to the drive electronics of the toothbrush, as represented by block 36, which is in turn driven by a power source 38, such as a battery.
  • the drive electronics 36 drives a magnetic drive coil 40, the action of which is coupled by a magnetic coupling arrangement 41 to a mechanical resonant system 42, which in turn drives the brush 44 in an oscillating manner.
  • the change of drive frequency about the center frequency Fc is accomplished by conventional frequency modulation means, which are well known, in which the drive frequency is changed at a selected rate.
  • the change of frequency could be accomplished by another arrangement. This arrangement is shown in Figure 8. Two simultaneously generated drive signals are combined together, with the resulting signal driving the brushhead.
  • a first frequency signal is generated by frequency generator 60, while a second frequency signal is generated by frequency generator 62.
  • one signal will be at the resonant frequency of the device, while the other signal will be a frequency somewhat removed from the resonant frequency.
  • the second frequency could be 242 Hz.
  • the difference will be in the range of 5-30 Hz.
  • the two signals are then applied to an op-amp 64, where they are combined.
  • the output of the op -amp 64 is a combined signal, the result of the two signals being "beat", which produces a change in brushhead amplitude.
  • the output is filtered to remove high frequencies.

Abstract

Ce système d'entraînement de la tête d'une brosse à dents à une fréquence d'entraînement comprend un système de modulation de la fréquence qui modifie la fréquence d'entraînement autour d'une fréquence centrale de façon à produire, avec une déviation sélectionnée de la fréquence et de la fréquence de modulation qui interagit avec la résonance de la tête de la brosse à dents, un changement de l'amplitude du mouvement de la tête de la brosse à dents dans une plage comprise entre 5 et 30 %.
EP04801524.2A 2003-12-15 2004-12-09 Changement de l'amplitude du mouvement de la tete d'une brosse a dents par modification de sa frequence d'entrainement(en) changing amplitude of movement by changing the drive frequency of a toothbrush brushhead Active EP1696818B2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE602004006777.6T DE602004006777T3 (de) 2003-12-15 2004-12-09 Veränderung der bewegungsamplitude durch veränderung der antriebshäufigkeit des bürstenkopfes einer zahnbürste

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US52959703P 2003-12-15 2003-12-15
PCT/IB2004/052741 WO2005058188A1 (fr) 2003-12-15 2004-12-09 Changement de l'amplitude du mouvement de la tete d'une brosse a dents par modification de sa frequence d'entrainement

Publications (3)

Publication Number Publication Date
EP1696818A1 true EP1696818A1 (fr) 2006-09-06
EP1696818B1 EP1696818B1 (fr) 2007-05-30
EP1696818B2 EP1696818B2 (fr) 2018-08-15

Family

ID=34700008

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04801524.2A Active EP1696818B2 (fr) 2003-12-15 2004-12-09 Changement de l'amplitude du mouvement de la tete d'une brosse a dents par modification de sa frequence d'entrainement(en) changing amplitude of movement by changing the drive frequency of a toothbrush brushhead

Country Status (7)

Country Link
US (1) US7979938B2 (fr)
EP (1) EP1696818B2 (fr)
JP (1) JP4647618B2 (fr)
AT (1) ATE363242T1 (fr)
CA (1) CA2549461C (fr)
DE (1) DE602004006777T3 (fr)
WO (1) WO2005058188A1 (fr)

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ATE482671T1 (de) 2004-06-30 2010-10-15 Koninkl Philips Electronics Nv Elektrische zahnbürste mit einstellbarem betrieb
EP2088959B1 (fr) 2006-10-31 2017-05-31 Koninklijke Philips N.V. Système pour adapter le fonctionnement résonant d'un appareil de soins personnels pendant la durée de vie de celui-ci
JP5277580B2 (ja) 2007-07-27 2013-08-28 オムロンヘルスケア株式会社 電動歯ブラシ
CN102271616B (zh) 2008-12-30 2015-11-25 皇家飞利浦电子股份有限公司 具有空间、时间和/或频率变化的超声洁牙用具
EP2410641A1 (fr) 2010-07-23 2012-01-25 Braun GmbH Moteur électrique linéaire
US9154025B2 (en) 2010-07-23 2015-10-06 Braun Gmbh Personal care device
US8558430B2 (en) 2010-08-19 2013-10-15 Braun Gmbh Resonant motor unit and electric device with resonant motor unit
EP2550937B1 (fr) 2011-07-25 2014-02-26 Braun GmbH Connexion magnétique entre la manche d'une brosse à dents et la tête de brosse
CN103703668B (zh) 2011-07-25 2016-12-07 博朗有限公司 线性电动聚合物马达和具有所述线性电动聚合物马达的装置
PL2550938T3 (pl) 2011-07-25 2015-06-30 Braun Gmbh Urządzenie do higieny jamy ustnej
US9190881B1 (en) 2011-08-02 2015-11-17 Tooltek Engineering Corporation Rotary-powered mechanical oscillator
USD766581S1 (en) 2013-12-19 2016-09-20 Colgate-Palmolive Company Electric toothbrush handle
US9744012B2 (en) * 2013-12-19 2017-08-29 Koninklijke Philips N.V. Power toothbrush with a modulated drive signal
USD769626S1 (en) 2013-12-19 2016-10-25 Colgate-Palmolive Company Refill head for electric toothbrush
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Also Published As

Publication number Publication date
DE602004006777T2 (de) 2008-02-07
US20080168611A1 (en) 2008-07-17
WO2005058188A1 (fr) 2005-06-30
ATE363242T1 (de) 2007-06-15
CA2549461A1 (fr) 2005-06-30
JP2007514397A (ja) 2007-05-31
CA2549461C (fr) 2013-02-05
DE602004006777D1 (de) 2007-07-12
EP1696818B1 (fr) 2007-05-30
DE602004006777T3 (de) 2018-12-27
US7979938B2 (en) 2011-07-19
EP1696818B2 (fr) 2018-08-15
JP4647618B2 (ja) 2011-03-09

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